Portable electric drill press



Aug 13, 1963 J. P. PUFAHL 3,100,408-

PORTABLE ELECTRIC DRILL PRESS INVENTOR.

Y WWW Aug. 13, 1963 .L P. PUFAHL 3,100,408'

PORTABLE ELECTRIC DRILL PREss Filed June 15, 1962 2 Sheets-Sheet 2' Jul/'us l? Pufa/ l N VEN TOR `This invention relates to new tand useful improvements in portable electric power drill presses and has Ifor, ,i-t s primary object to provide, in aymanner as hereinafter set lforth, novel means for lslidahly supporting a tool of this character in a `true perpendicular position relatively to-the workpiece. Another highly impor-tant object of the presentV invention is to provide a portable electric power drill pressfof Ithe aforementioned character comprising means whereby the'hole maybe expeditiously and accurately drilled at any desired angle. t Y Y Still another important object to provide a portable electric power drill whichfembodies unique means for regulating the depth of the hole.

Another object is to provide a drill ofthe character set forth wherein the angle, the depth, etc., attachments may he expeditiously removed when desired to permit said drill to be used conventionally. l Y

Other objects of the invention are to provide a por-table ly but removably secured on the drill 6. The plate has formed-in `its upper-potrionfa generally U-shaped kcutout oropenin-g 24-whichaccommodates the bit 11.

Removably mounted on the plate 14 of the holder 13 is an angle gaugegZS. The gauge'ZSgincludea in the ernlbodiment shown, *a laminated metallic base plate 26; havingusmooth oi-.unthreaded openings 27 in its corner'por-ltion foralignment with `threaded openings r28. inthe corresponding portions of the plate "14.l The registering openings 27 and 28. are for the reception iof eountersunk screws 29 which detachably secure the angleV gauge 25 on thepllate The upper'portion of the hase 26 of the anglepgauge 215 is further provided with a generally U-shaped cutout yor opening -30 which'registers with-the opening24 inthe Y plate 14; Below the opening or cutout-30, the lower por--V tionlof the-base 2 6hasformed therein athreaded opening of the present invention is'- 33 pivotally'connects the contact plateh32 to the lowerportion of the base plate 26. As shownl to advantage in electric power drill which is comparatively simple in conf struction, strong, durable, compact, Oflight weight and which rnay be manufactured at low 00st,.

These together'with other objects and advantages which will become subsequently apparent reside in the details of scribedY and claimed, reference being had tothe"accorn i construction and-operation-as more fully hereinafter de- FIGURE 3 of theldrawing, the opening 31 -is in registry with a relatively large,y smooth or unthreaded opening 34 in the lower portionof the.` plate 14,:below 5th or recess 24. The open1ng1f3i4.accommodatesanad ing screw or bolt 35 for the contact plate 3&2.

36.. Afwingedflocknut. securesthe screw' 35 in ad* l Yjusted position, saidlock "n ut heingfeiiigageahlevwith the desired position;

that the luse or operation of theinvenr' tric power drill constructed in accordance with'the present invention;-

FIGURE 2 is a top plan View thereof;

FIGURE 3 is a fragmentary view in longitudinal. t -section through 4the forward or lower portion of the assemi -bly taken substantially on the line 3 3 of FIGURE 2;

' plate. 14. Afpotractor 38 isprovided on thejcontact plate' 32 to facilitate-adjusting the angle gauge 25 to the ifs thgusht tion will 'he readily apparent fromfa consideration of the foregoing. lriey, when a hole-is be drilled penpendicularto tlreworkthe anglel gaugerZS may-beomi-tt'ed.

The plate 1 4 is brought into face-'abutting engagementv g with 'the workpiece thus positioning thearms 15 at `vright (angles thereto. .The drill 6 is thenxfed to the workin FIGURE 4 is a View in transversesection, taken substantially on the line 4 -4 of FIGURE 2; and

FIGURE 5 is an exploded perspective View of the'atf tachment, showing the parts removed from the drill.

Referring now to the drawing in detail, it will beseen 6 includes an electric motor housing 7, a grip 8, a trigger switch 9, and a chuck 10, said chuck having mounted 'Ihedrill 6 is mounted in a removahleholder 13.l 'I'he plate 14 of suitable metal and of any desired dimensions. The plate 14 is fiXedly mounted on `one end of apair. of spaced, parallel arms 15in the form of at metallic bars which are slidably engaged in the grooves or :channels 12 of the drill housing 7. The arms 15 are graduatedias indicated at 16 and mounted for sliding adjustment on either or both of said arms is a depth regulating collar or stop 17 which is secured in adjusted position through the medium of `a setscrew 13.

The inner or rear end portions of the arms 15 are apertured at 19 to receive a connecting bolt 20 having a knurled head 21 on one end. A wing nut 22 is threaded on the other end portionfof the bolt 20. Mounted on the :bolt 2t) is a removable handle 23 which also functions as a spacer for the arms 15. Thus, the holder 13 is firmthat the embodiment of the invention which has lbeen illus- .v trated compdises a portable electric power drill which is designated generally by reference numeral 6. The drill.'

contact plate 32 'is adjusted to the desired angle andthe work proceeds `suhstantiallyfas above described; It will. he observed that the construction and arrangement is such y that the parallel arms or bars 15 are free of the operators holder 13 includes "a generally rectangular hase or face' an obvious manner, said drill sliding on the arms 15, the

tool 11 contacting the work'through the opening or recess Y t 24 in the plate 14. By adjusting `the stop 17 on the respective arm 151the forward movementiof thedrill maybe arrested-at any point for regulating the 4depth of the hole,` f

las lwill be apparent. The scales 161011 the arms facilitates adjusting-the stops 17 to thedesired position. When itis desired to drill the hole atsome other angle', the' attachment 25 is secured in position onthe plate 14 of the holder llipfThrough the medium of the screw 3,5 the hand and the work to be done is clearly jvisible. VBy

sim-ply removingthe handle 23 from the arm-s`715 the hold-v er 13 may be detached for permitting the electric drill 6' to be used conventionally. The construction and arrangethe `angle gauge 25 on the platev14x If desired, an emery wheel or other tool maybe secured in the chuck 10 of the drill 6. The upper portion of the contact plate 3-2 is provided with -a `generally U-shaped opening or recess'3-9 4for registry with the openings 24 and 30, said opening 39 also accommodating the drill bit 11. In addition to functioning asa guide for the tool during -a drilling operation, the unit or holder 13 serves las a guard for the bit 3,100,405@ Patented Aug. 13,1963

`-'-."I'he foregoing is"consider'ed"as i principles` of thefinvention." YFur-ther?since' numerous -modiioatihsi-and kth-einiges"jfWill readily-vcclir'tothose skilled in the art,l it isy notdesired to limit?Y the invention to the enact'construction and opeationishown and'describedg Y .an "accordingly all sui-table'modiiications and equivalents Y may niet the angle `gauge'25 is laminated;

by tightening the 1,ving nutZZ on Vthe jbolt 20`the sliding resorted Vfto,' f a`l1ing Within the scope v`of the inveneincluding -a pair" of bars longitudinally -slidably rewith claim l, ltogether with a handle removably mounted between the rearend portions ofthe bars.

7. A portable electric drill attach-ment in accordance with claim 6, said handle including a nutted bolt connecting'the bars', and a removable .grip on the )bolt between the 8. A portable electric drill attachmentcomprising elongated guide'means'adapted to have an electric drill guidingly mounted thereon; for movement 4longitudinally of saidguide means {andfwith the axis of rotation of the chu-ck ofthe drillgenerally'lparallelingjsaid guide means,

l a transversely extending mounting` platesecured` to lone end4 ofsaid Yguide meansa Aworkpieee-contacting plate on said mounting-plate, meansfor'adjust-ing rtlnecontactingplate? said! means Vincvzludingla 'screwythreaded' through *A mogtigpltefwrr"abugfingrengagemet 'with gazidon; chuck/ofthe drillgenerally parallelingL-said guide means,y

the

aimflgtog'etherwith a Vstpcollarr mounted -for ionil 62 'AY- portable Velectric .drill 2.V portable VVAelectric 'drill attachment Y in 'accordance ing'adjustmentjjon fajtjleast =one of .the amis one of said platesor Yabutting engagement with the other "tmate 'in movement-'erthefdrin inthe g 's 'g :a Y 'Y ofV said'plates for Ypositively` adjusting the position. to

@sans accordance 7 to which said ivorkpieeeontacting V'relative to said mounting plate.

hingedly mountedlfroi 4for swinging movement rel-aother fplatef and operativeto'positively-adjust the position 9.'v A portable Veleetific': drill attachment comprising elon Agated guide means adapted toihave an electriedrill guiding'lyV mounted thereon for 'movement longitudinally of saidguide means andwith vthe axis of rotation ofthe a' transevrsely "extending mounting plate Vsecured to one end of said guide means, a workpiece-contacting plate hinge/dly mounted from and for swinging movement rel-ative to said mounting plate, anda screw threaded through 'rfRferencesV/Cited o ithis'patent plate may be swung f 

8. A PORTABLE ELECTRIC DRILL ATTACHMENT COMPRISING ELONGATED GUIDE MEANS ADAPTED TO HAVE AN ELECTRIC DRILL GUIDINGLY MOUNTED THEREON FOR MOVEMENT LONGITUDINALLY OF SAID GUIDE MEANS AND WITH THE AXIS OF ROTATION OF THE CHUCK OF THE DRILL GENERALLY PARALLELING SAID GUIDE MEANS, A TRANSVERSELY EXTENDING MOUNTING PLATE SECURED TO ONE END OF SAID GUIDE MEANS, A WORKPIECE-CONTACTING PLATE HINGEDLY MOUNTED FROM AND FOR SWINGING MOVEMENT RELATIVE TO SAID MOUNTING PLATE, AND ADJUSTABLE MEANS SUPPORTED FROM ONE OF SAID PLATES AND ENGAGED WITH THE OTHER PLATE AND OPERATIVE TO POSITIVELY ADJUST THE POSITION 